CN1129878C - EAS maker deactivation device having core-wound energized coils - Google Patents
EAS maker deactivation device having core-wound energized coils Download PDFInfo
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- CN1129878C CN1129878C CN98813372A CN98813372A CN1129878C CN 1129878 C CN1129878 C CN 1129878C CN 98813372 A CN98813372 A CN 98813372A CN 98813372 A CN98813372 A CN 98813372A CN 1129878 C CN1129878 C CN 1129878C
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B13/00—Burglar, theft or intruder alarms
- G08B13/22—Electrical actuation
- G08B13/24—Electrical actuation by interference with electromagnetic field distribution
- G08B13/2402—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting
- G08B13/2405—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting characterised by the tag technology used
- G08B13/2408—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting characterised by the tag technology used using ferromagnetic tags
- G08B13/2411—Tag deactivation
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B13/00—Burglar, theft or intruder alarms
- G08B13/22—Electrical actuation
- G08B13/24—Electrical actuation by interference with electromagnetic field distribution
- G08B13/2402—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting
- G08B13/2405—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting characterised by the tag technology used
- G08B13/2414—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting characterised by the tag technology used using inductive tags
- G08B13/242—Tag deactivation
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- Burglar Alarm Systems (AREA)
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
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Abstract
A device (50) for deactivating a magnetomechanical EAS marker includes a coil (64, 66, 68, 70) and circuitry (72) for energizing the coil to generate an alternating magnetic field. The coil is wound around a magnetic core (52). The core may be cruciform with four arms, on each of which a respective coil is provided. Alternatively, the core may be generally square and planar, with two coils (102, 104) wound around the core (100) in different respective directions.
Description
This application is that the part of the copending application sequence number 08/794,012 of proposition on February 3rd, 1997 continues.
Technical field
This invention is usually directed to electronic article surveillance (EAS) and more specifically is suitable for making the what is called " deactivator " of EAS marked invalid.
Background technology
In the electronic article surveillance industry, usually with the EAS tag application in commodity.Checkout equipment is positioned at market outlet detection and attempts to shift out the activation tagging in market, and produces alarm in this case.When a client shows commodity when check-out counter is paid the bill, the cashier makes marked invalid by the maker deactivation device that makes the mark deactivation that use provides.
Known maker deactivation device comprises one or more coils, and it can encourage the magnetic field that produces enough amplitudes to make the mark deactivation.A kind of well-known types mark (at U.S. Patent number 4,510,489 in disclosed) is called as " magnetic mechanical " mark.The magnetic mechanical mark comprises a movable element and a bias element.When bias element is magnetized, the bias field that acts on movable element that produces make must by with predetermined frequency mechanically the movable element of resonance be exposed to the preset frequency alternation and produced in the interrogating signal by detecting instrument, and the resonance of mark is detected by detecting instrument.Typically, the magnetic mechanical mark removes the magnetic of bias element by the alternating magnetic field that makes bias element be exposed to sufficient intensity and is deactivated.After bias element was by degaussing, in fact the resonance frequency of mark floated from predetermined frequency, to such an extent as to and mark be not the detecting instrument detection to the amplitude of the response of interrogating signal is too low.
Except the deactivator commonly used of utilizing the coil of using the alternating signal excitation, the application's assignee has improved the additional maker deactivation device with favourable operating characteristic.That propose the 3 days February in 1997 of the pending trial at the same time and title of in these devices one is disclosed in the patent application serial number 08/794,012 of " the long-range deactivator of the multi-thread circle of leggy pattern that is used for magnetic mechanical EAS mark ".' 012 application has common inventor with the application and discloses the embodiment that some are used to make the device of magnetic mechanical EAS mark deactivation.The disclosed emphasis of ' 012 application is exactly that wherein disclosed deactivator reality orientation on three mutually perpendicular directions provides alternating magnetic fields to realize that mark deactivates reliably, no matter residing orientation when mark is deactivated.The maker deactivation device of ' 012 application can guarantee also that mark deactivated reliably when both being used in deactivated mark apart from the certain distance of maker deactivation device (about several inches).In the disclosed embodiment, the square coil on four planes is disposed on the common plane with two or two approaching mutually arrangements in ' 012 application, and maker deactivation device is switched between two operator schemes repeatedly.In first operator scheme, driven simultaneously with mutually opposite phase place along two coils at two pairs two diagonal angles of arranging, and other two coils are not driven.In second kind of pattern, two coils in back are driven with mutually opposite phase place, and two coils are not driven.
Another patented claim of pending trial simultaneously is series number 08/801,489 application that proposed on February 18th, 1997, and title is for " being used to make the device of the magnetic mechanical EAS mark deactivation that invests the magnetic recording medium product " and have the inventor identical with the present invention.In ' 489 applications, the maker deactivation device that has disclosed utilization " flat " coil plane to arrange, wherein magnetic field gradient be reduced and maker deactivation device near usually uniformly magnetic recording level is arranged so that magnetic mechanical EAS mark can be deactivated reliably and can the acting in opposition mark by additional magnetic medium product.
Although above-cited ' 012 and ' 489 applications are considered to represent the progress on deactivator commonly used, the inventor has realized that for improved more opportunity on mark deactivation equipment.
Summary of the invention
A main target of the present invention is the modifying device that will be provided for deactivating magnetic mechanical EAS mark.
The present invention's target more specifically is the maker deactivation device that will provide with the power level operation lower than device commonly used, and can be manufactured with lower cost.
Another target of the present invention is to provide actual motion to need not responsive maker deactivation device for the orientation of deactivated mark.
The invention provides a kind of equipment that is used to make the degaussing of magnetic mechanical mark, it is characterized in that: the magnetic core in same plane; One first coil is wound around described magnetic core with one first coil axis, described first coil axis is parallel to described magnetic core plane, one second coil is wound around described magnetic core with one second coil axis, and described second coil axis is parallel to described magnetic core plane and perpendicular to described first coil axis; Exciting bank only is used at described first coil of excitation during the very first time intervening sequence rather than during second time interval sequence that replaces with very first time intervening sequence; And only be used to encourage described second coil during second time interval sequence rather than during described very first time intervening sequence.
This magnetic core for example can be by powdered-metal, cast iron, and silicon steel, carbon steel forms.
In one embodiment of the invention, described magnetic core is criss-cross and has first and second arms, and described first coil is wrapped in around the described the first arm, and described second coil is wrapped in around described second arm.
In another embodiment, described magnetic core has three arm relative with described the first arm and four arm relative with described second arm, described equipment comprises and is wrapped in the tertiary coil around the 3rd arm and is wrapped in the 4th coil around the 4th arm, wherein only during described very first time intervening sequence, described exciting bank encourages described first and tertiary coil, and excitation the described second and the 4th coil during described second time interval sequence only.
Further, wherein said magnetic core is a rectangle, and can the side of being.
In another embodiment, wherein said magnetic core has first, second, third and fourth side, described the 3rd side is relative with described first side, described the 4th side is relative with described second side, described first coil is wrapped in around described first side, described second coil is wrapped in around described second side, described equipment comprises and is wrapped in the tertiary coil around described the 3rd side and is wrapped in the 4th coil around described the 4th side, wherein only encouraging described first and tertiary coil and excitation the described second and the 4th coil during described second time interval sequence only during the described very first time intervening sequence by described exciting bank.
Further, the wherein said magnetic core side of being.
In another embodiment, have at least one to be wound in wherein said first and second coils around described magnetic core a plurality of layers on every side, described a plurality of layer comprises an innermost layer and another layer, more near magnetic core, described innermost layer is by being constituted than the more number of turn of described another layer than described another layer for described innermost layer.
In another embodiment, at least one coil in the wherein said coil is wound in three layers that are made up of an innermost layer, middle layer and outermost layer; Described innermost layer than described middle layer near magnetic core, described middle layer than described outermost layer near magnetic core; Described innermost layer is made of the number of turn of Duoing than described middle layer, and described middle layer is made of the number of turn of Duoing than described outermost layer.
In another embodiment, described magnetic core is made up of first magnetic core and second magnetic core, and described first coil is wrapped in around first magnetic core of described magnetic core, and described second coil is wrapped in around second magnetic core of described magnetic core.
In another embodiment, described exciting bank is responded to exchange current respectively in described 2 coils, exchange current be simultaneously and differ 90 ° phasing degree each other.
According to a further aspect of the invention, a kind of method that makes the deactivation of magnetic mechanical EAS mark is provided, and the step that comprises provides to be wrapped in magnetic core coil on every side, make coil magnetization producing an alternating magnetic fields, and mobile EAS mark by alternating magnetic fields so that the control element degaussing of mark.
Utilization is wrapped in coil around the magnetic core and produces deactivation a kind of maker deactivation device that magnetic field provided and can be configured according to the present invention, so that the spatial dimension that occupies with respect to deactivation magnetic field is compacter than the device that does not utilize magnetic core.Therefore, be used for the needed numbers of copper lines of coil and can be reduced, the cost of device is lowered with respect to the device that does not wherein utilize magnetic core.In addition, for given magnetic field amplitude, in according to maker deactivation device provided by the invention, drive coil desired power level littler.
Description of drawings
The present invention above-mentioned with other target, characteristic and advantage will be better understood by the following detailed description and the drawing of most preferred embodiment, wherein similarly reference symbol is represented similar elements and parts.
Fig. 1 is the isometrical drawing of a magnetic core of winding around thereon that has that is used for providing in one embodiment of the invention.
Fig. 2 is by the difference on the magnetic field intensity that field coil provided that has and do not have the magnetic core of coil around being wrapped in graphical method explanation.
Fig. 3 is at the surface curve figure that is parallel to the magnetic field intensity of measuring on the horizontal direction of core length that magnetic core produced of being twined by Fig. 1 coil.
Fig. 4 is the surface curve figure by the field intensity that magnetic core produced of Fig. 1 that measures in vertical direction.
Fig. 5 represents the planimetric map that can select two T shape structures that magnetic core constituted using among the embodiment by at one of the present invention briefly.
Fig. 6 is according to one embodiment of present invention, contains the figure of simple plane a little of a mark maker deactivation device of cruciform magnetic core.
Fig. 7 is that the part signal and the part square circuit of the maker deactivation device of Fig. 6 represented.
Fig. 8 is according to another embodiment of the invention, and of being wound two coils thereon is square, the perspective view of the magnetic core on plane.
Fig. 9 is the schematic plan view of " picture frame " magnetic core of using in yet another embodiment of the present invention.
Fig. 9 A is the distortion of key diagram 8 embodiment, a sectional view of illustrating a little of cutting open along the A-A line in Fig. 8.
The additional details of Figure 10 presentation graphs 7 circuit.
Figure 11 is illustrated in the current drives round-robin oscillogram that acts on paired coil in the circuit of Figure 10.
Embodiment
Fig. 1 represents to be suitable for the magnetic core 20 of one embodiment of the invention.Magnetic core be rectangular cylinder shape and, for example can have 8 inches long, 3.5 inches wide and 1 inch are thick.Magnetic core 20 can be by relatively cheap ferromagnetic material, powdered-metal for example, and cast iron, silicon steel or carbon steel constitute.
Coil 22 be expressed be wrapped in magnetic core 20 around.In order to illustrate, the coiling of coil seldom is expressed.In fact, in the embodiment of a reality, the number of turn is hundreds of circles.The coiling axis of coil 22 is consistent with the major axis of magnetic core 20.Coil 22 has the exit 24 and 26 that can be connected to the driving circuit (not shown) by its coil 22.Certainly, suitable shell (not shown) can be installed in core 20 and coil 22 around.
When coil 22 during by excitation, magnetic core 20 has formed the dipolar magnet that has corresponding to the length direction of core length.On the contrary, if be desirable to provide the dipolar magnet of equal length, utilize being arranged side by side of planar coil according to the theory of 012 application of above quoting, bigger " footprint (footprint) " that be used for maker deactivation device will be required.Concrete example is provided, has about 28 square inches footprint as the magnetic core that 8 inches dipoles are provided mentioned above.Provide the dipole of the same length of side by side planar square coil of utilization (arranging) will need two 8 inches square coils of 128 square inches combination footprint a common plane.
Fig. 2 illustrates the magnetic recording level in the magnetic field that the existence of magnetic core produces when how to be amplified in coil magnetizing effectively with graphical method.For the represented measurement of Fig. 2, coil 22 usefulness constitute around the magnetic core 493 circle coils of the size that has above statement, and with 5 amperes DC current excitation.Although (the DC drive signal is used to obtain the measurement result that this paper reports, recognize in the practical application of maker deactivation device, and the AC drive signal will be utilized the deactivation magnetic field that produces alternation.) being parallel to the core length direction, the reading of field intensity is gathered on the different distance on the coil.The reading of being gathered when curve 28 expression magnetic cores 20 are placed, and the reading that curve 30 expression magnetic cores 20 are gathered when being removed.
The effective amplification in the effective permeability of magnetic core 20 and magnetic field changes according to the distance on the measured coil in magnetic field thereon.As in Fig. 2 finding, in the magnetic field of coil itself when magnetic core is placed near 120 Oe, approximately have only 4 Oe when not having magnetic core, make like this that effective magnetic in magnetic field is approximately 30 on coil.On the other hand, the height of 10cm on coil 22, field intensity approximately is 10 under 10 Oe and in effective amplification of this height field just in time when magnetic core is placed.As can be seen from Figure 2, no matter be that the magnetic recording level in the magnetic field that is produced has been amplified in the placement of magnetic core 20 widely on the coil 22 or magnetic field of several centimetres of measurements on coil 22.
Recognize that the feasible more powerful deactivation magnetic field that is used for the given magnetic recording level of drive signal that provides of magnetic core will be produced.On the contrary, if use magnetic core to allow given magnetic recording level given distance on coil in deactivation magnetic field to remain on actual specific when using air-core on the low drive signal level.
The magnetic figure that coil arrangement produced that is twined magnetic core by Fig. 1 is expressed in Fig. 3 and 4 in more detail.For at Fig. 3 and 4 represented curve maps, the physical dimension of magnetic core be 10 inches long take advantage of 3 inches wide take advantage of 1 inch thick.Coil twines with 1200 circle lines and with 5A DC current excitation.The field magnetic recording level of being drawn in Fig. 3 and 4 is gathered in constant altitude about 6.5 inches on the coil each position on horizontal plane.For the coordinate system of reference in Fig. 3 and 4, X and Y direction are fetched water flat, and X-axis is parallel to the length of magnetic core and Y-axis is vertical with X-axis.The initial point of X-Y is taken at an end of magnetic core and in the center with respect to the width of magnetic core.The data of being drawn in Fig. 3 are illustrated in the intensity in (that is, in X-direction) magnetic field on the direction that is parallel to core length, and the data of drawing in Fig. 4 are illustrated in effectively magnetic field of vertical direction (" Z axle ").
From Fig. 3, will see that the middle position of magnetic field between two ends of magnetic core along its length is the strongest, and vertical magnetic field is the strongest at the two ends of magnetic core, is very low between the two ends of magnetic core.
The coil arrangement of the winding magnetic core of Fig. 1 produces very little magnetic field in the horizontal direction of crosscut core length, and is not very effective in the deactivation magnetic mechanical EAS mark that the length to the mark of horizontal crosscut core length provides therefore.Overcome this shortcoming, maker deactivation device can with as the magnetic core with two winding arounds that landing tee puts illustrated in fig. 5 constitute.As can be seen from Figure 5, magnetic core 20 and 20 ' be disposed in the plane and with magnetic core 20 ' the centre of an end 34 contiguous magnetic cores 20 locate with orthogonal direction.(coiling of coil, driving circuit and electrical connection are by omitting among Fig. 5 to simplify drawing.)
A magnetic mechanical mark, will guarantee to be exposed to actual magnetic field along the length of mark near magnetic core 20 and 20 ' flat scanning along the indicated track of arrow 32, no matter the direction of sign how.Especially, mark will be exposed to the horizontal magnetic field by the magnetic core 20 that is parallel to magnetic core 20 ' length ' produced, and also will be exposed to magnetic core 20 ' the vertical magnetic field that produced of termination 34.Finally, mark will be exposed to length that is parallel to magnetic core 10 and the horizontal magnetic field that is produced by magnetic core 20.The maker deactivation device of brief description is called as " omnibearing " in Fig. 5, because the validity of maker deactivation device is insensitive to the direction of mark.
Be expressed in the schematic plan view of Fig. 6 according to the more effective deactivator in space provided by the invention.The maker deactivation device of Fig. 6 is represented by reference digital 50 usually, and is comprised a cruciform magnetic core 52.Magnetic core 52 has a core 54, from it, arm 56,58,60 and 62 penetrate with interval width of cloth in a public plane of 90 °.In a most preferred embodiment, all arms are isometric, it approximately is 10 inches (for example from the top of arm 56 to the top of arm 60) that magnetic core is measured from the top of an arm length at the top of relative arm, and each arm has about 3 inches width and about 1.5 inches height.Then, core 54 can be considered to be formed in 3 inches square in the plane of magnetic core 52.
In maker deactivation device 50, also comprise driving circuit 72.(connection between driving circuit 72 and coil 64,66,68 and 70 is omitted to simplify drawing.) above-mentioned all elements of deactivator 50 are accommodated in the housing 74, it can adopt the form of the low cross section (low-profile) of the sort of flat-top plastic casing that utilizes in " deactivation pad " device commonly used.
Fig. 7 illustrates that with the mode of signal formation comprises coil 64,66, the electronic component of 68 and 70 deactivator 50, and these coils are connected to power supply via an isolating transformer 76 and above-mentioned circuit 72.
In operation, driving circuit preferentially moves so that active device 50 repeatedly is switched between two operator schemes fast.In first operator scheme, the signal of a coil 64 and an alternation of 68 usefulness is by the while excitation and constitute bipolar corresponding to the alternation of arm 60 and 56 on phase place.Coil 66 and 70 is not driven in first pattern.In second pattern, the signal of a coil 66 and an alternation of 70 usefulness is by the while excitation and constitute bipolar corresponding to the alternation of arm 58 and 62 on phase place mutually. Coil 64 and 68 is not driven in second pattern.
Best, each pattern took place several times in p.s..Understand that the number of times of first pattern is in fact corresponding to very first time intervening sequence, and the number of times of second pattern is in fact corresponding to second time interval sequence of intersecting with very first time intervening sequence.The alternating signal that is used for drive coil for example, can be the standard mains frequency of picture 60Hz or 50Hz, perhaps can be in the scope of hundreds of hertz.
During first operator scheme, a strong horizontal magnetic field is produced in the direction that is parallel to arm 60 and 56.An important vertical magnetic field is also produced at the end of arm 60 and 56.In addition, during second pattern, a strong horizontal magnetic field is produced in the direction that is parallel to arm 58 and 62, and the end of vertical magnetic field in arm 58 and 62 produced.A magnetic mechanical mark that is flatly slipped near the top of device 50 shell 74 will be exposed to high-intensity magnetic field along the length of mark, in fact not consider the direction that mark is wherein slipped over or the azimuth direction of mark lengths.
Fig. 8 is another magnetic core and twines the perspective view of arranging that it can be used according to the present invention in the mark maker deactivation device.The always square and plane of the magnetic core of in Fig. 8, representing 100 and be preferably in horizontal direction and be loaded into a maker deactivation device.One first coil 102 is by two sides of the coiling axle horizontal of coil 102 being located and is parallel to the magnetic core 100 that is crossed by coil 102 on every side around magnetic core 100.One second coil 104 is also by around magnetic core 100, and the coiling axle horizontal of coil 104 location is also vertical with the coiling axle of coil 102.Coil 102 has the (not shown) exit 106 and 108 that is used for coil 102 is connected to driving circuit.Equally, coil 104 has the exit 110 and 112 that is used for coil 104 is connected to driving circuit.Wherein the maker deactivation device (not shown) that is mounted of magnetic core 100 is preferably in and repeats between two kinds of operator schemes and switch apace.In first pattern, coil 102 is driven and coil 104 is not driven, and the two poles of the earth are formed at the coiling direction of principal axis corresponding to coil 102.In second kind of pattern, coil 104 is energized and coil 102 is unexcited, has formed the two poles of the earth in the direction corresponding to the coiling axle of coil 104.
According to a kind of mode of this embodiment that makes deactivator, one in two coils at first by around magnetic core 100, and subsequently second coil by on magnetic core and cover on first coil.
Be similar to the maker deactivation device 50 of Fig. 6, utilize the maker deactivation device of Fig. 8 magnetic core 100, during each pattern in two operator schemes, on the direction separately in two orthogonal horizontal, produce sizable magnetic field.In fact Billy is wide with the two poles of the earth that the cruciform magnetic core 52 of Fig. 6 constitutes to utilize the two poles of the earth that magnetic core 100 constitutes, makes the magnetic field of generation in fact have lower gradient like this and is more suitable for using magnetic medium product as the prerecord tape cassete.
In the embodiment shown in fig. 8, has a plane and be that square magnetic core is utilized basically.Yet, also plan to utilize the magnetic core on plane, it be rectangle and also broken away from square to a certain extent.Square with regard to rectangle magnetic core right and wrong, in that being provided, the magnetic field gradient that provides on the horizontal direction of magnetic core side will trend towards increasing.What provide for deactivation as a result, is marked at and will be tending towards standing a relative ringdown signalling of AC fast on the maker deactivation device when inswept with one that occurs on increasing the direction of gradient.If effectively the low frequency supervision is too fast, deactivation reliably can not guarantee.The square core of in Fig. 8, representing since the deactivation magnetic field that it provides a kind of relative no sensitive direction from but best.
Fig. 9 has illustrated another kind, can be used to replace the magnetic core form of the cruciform magnetic core 52 in the maker deactivation device 50 of Fig. 6.The plane of square hollow or " picture frame " form represented and normally has by magnetic core 120 with the form of the planimetric map among Fig. 9.Magnetic core 120 has the some coils in coil 64,66,68 and 70 around in four limits 122,124,126 and 128 that are wrapped in it respectively each.Clearly, coil 64 and 68 has the coiling axis that is parallel to each other respectively, and coil 66 and 70 has respectively and is parallel to each other and perpendicular to the coiling axis of coil 64 and 68 axis.
As preamble, improved maker deactivation device is with two kinds of mode operations that replace, and in every kind of pattern therein, a relative coil makes the two poles of the earth of mutually orthogonal level be formed respectively two kinds of patterns to being energized like this.The excitation phase place of coil should be such, i.e. no current circulation in magnetic core 120.When coil 68 and 64 was driven with first kind of pattern, one bipolar was formed on the horizontal direction of the limit 126 that is parallel to magnetic core 120 and 122.When coil 66 and 70 was driven with second kind of pattern, one bipolar was formed on the horizontal direction of the limit 124 that is parallel to magnetic core 120 and 128.The advantage that is provided by the magnetic core form of Fig. 8 is with respect to Fig. 1, and those forms of 5,6 and 9 have than using Fig. 1,5,6 and 9 the low gradient in the magnetic field that form produced with regard to the magnetic field that is to use magnetic core 120 to form.In other words, the ratio in the magnetic field magnetic recording level of the upper surface of maker deactivation device and magnetic recording level on a certain distance on the upper surface (for example 5 inches) is minimum.Therefore, such device is suitable for and the mark that is applied to for example prerecorded video of magnetic medium product or audio cassette uses together very much.
Imagination is by the mode coiling with auxiliary minimizing magnetic field gradient, to improve the embodiment of Fig. 8.For example, coil can be used, and has the innermost layer of the maximum number of turn and has two layers or multilayer such mode of number of turn adjacent layer still less by coiling with respect to the interior layer that is right after.
Fig. 9 A schematically illustrates this improved embodiment.In Fig. 9 A, have only coil 104 ' be expressed, be omitted to simplify drawing corresponding to the coil of Fig. 8 coil 102.Coil 104 ' quilt is around 114,116, and 118 layers, 114 layers is innermost layer (near magnetic core 100), and is made of maximum numbers of turn.116 layers are positioned at 114 layers and 118 layers of centre, and have and be less than 114 layers and more than 118 layers the number of turn.118 layers three layers most external (apart from magnetic core 100 farthest), and has the number of turn that is less than other each layer in two-layer.(, form 114,116,118 layers the independent number of turn and do not represent for simplifying drawing.)
In two patterns that replace, be used for the circuit details of drive coil will to be narrated by means of Figure 10 and 11 now.Symbol 130 expressions are provided to an AC power supplies signal of circuit in Figure 10.Driving circuit 72 comprises a microprocessor 132, and it is by control and interface circuit 138 gauge tap 134 and 136.The input power supply is provided to coil to 64 and 68 selectively via switch 134.A resonant capacitance 140 is connected to and constitutes the resonance lc circuit that has coil 64 and 68 between switch 134 and coil 64 and 68.A resonant capacitance 142 is connected and constitutes the LC resonant circuit that has coil 66,70 between switch 136 and the coil 66,70.
Zero-crossing detector circuit 144 detects the zero crossing on the input power supply signal and the detection signal of correspondence is provided to microprocessor 132.Be positioned at or one or more optical sensors of the housing 74 (Fig. 6) of contiguous maker deactivation device detect the action of maker deactivation devices and the detection signal of correspondence is provided to microprocessor 132 by an interface circuit 148.In preferably two of the quantity of the optical sensor 146 that provides, two sensors 146 each is positioned at the center on the relative top side of maker deactivation device housing 74.Only use an optical sensor as using three, four or a plurality of optical sensor equally are feasible.If four sensors are used, can be placed equally, make that like this center of each side provides a sensor on four sides at the top of housing 74 (Fig. 6).
Continuation is with reference to Figure 10, and a user's interface device 150 is connected input signal is provided to microprocessor 132.User's interface device 150 makes a user remove to be provided with the operating parameter of maker deactivation device.Can comprise that (a) acts on the load cycle of the drive signal of coil by the operating parameter that the user is provided with, (b) act on the drive signal peak amplitude (power level) of coil, and/or (c) trigger action be operated the selection of operating with continuous wave.
In operation, a most preferred embodiment of maker deactivation device 50 with two switches opened 134 and 136 is maintained at a stand-by state usually, and do not have electric current to flow through coil 64,68,66 and 70, make that so not deactivating magnetic field is provided, and power consumption is low.When action was surveyed by one or more optical sensor 146, a motion detection signal was provided to microprocessor 132 by sensor interface circuitry 148.According to the motion detection signal, microprocessor 132 is in the time cycle that next section of condition for validity limits in advance with maker deactivation device 50.The preset time cycle for example can be about 0.5 to 2.0 second.When maker deactivation device 50 during at the state that activates, it in the middle of two kinds of operator schemes alternately.In first kind of operator scheme, switch 134 is closed and switch 136 is opened, and coil is energized 64 and 68.In second kind of operator scheme, switch 136 is closed and switch 134 is unlocked, and coil is energized 66 and 70.
Maker deactivation device is illustrated with the operating among Figure 11 of mode that replaces in two kinds of operator schemes.As seeing from Figure 11, every pair of coil is driven a circulation of power supply signal, and another is to being driven a circulation then, and this is repeated in proper order.
Understand, in the resonant circuit that constitutes by every pair of coil and its electric capacity separately, 90 ° of phase places of the electric current of electric capacity and variation.Figure 11 represents by the current waveform of its each coil to the signal that is energized.Be driven a circulation of a drive signal at a pair of coil after, operator scheme is switched, and another is driven a circulation subsequently to coil.The conversion of pattern is finished corresponding to the right switch of the latter's coil by opening corresponding to coil right switch in front is also closed simultaneously basically.Mode switch took place in the moment corresponding to crest voltage in the circulation and zero-current point.Then, when loop ends, at zero point, and capacitance voltage is maximum at the electric current of the former coil pair.Because switch is opened in zero-current point, voltage on the electric capacity of correspondence is held, and during being open mode, the switch of correspondence do not have the low frequency supervision, suppose that it is 60Hz that Figure 11 imports power supply signal, be one second sixtieth like this corresponding to each round-robin time of drive signal, and at interval that each coil pair drive signal repeats corresponding to 30Hz.
Imagination is applied in the present invention in the maker deactivation device, the such coil of two couples that it utilizes the magnetic core of two winding arounds or does not switch between operator scheme.On the contrary, each separately coil or coil to driving with the alternating signal of 90 ° of the drive signal phase differential right with being used for other coil or coil.A this instrument can be by continued operation, and being used for the right drive signal of each respective coil or coil may be from the input power supply signal of ball bearing made using very, for example, be used for the right single electric capacity of each coil or coil, cause respectively in the power supply signal in input+phase drift of 45 ° and-45 °.Utilize 90 ° of phase differential drive coils or coil can have the pumping signal that is used on low relatively magnetic recording level, providing coil, be fit to act on the deactivation mark of recording medium product, as the prerecord tape cassete to this maker deactivation device of also operating continuously.Further imagination adopts 90 ° of phase differential drive coils or the right maker deactivation device basis of coil to represent by the action of optical sensor detection or according to other input of wanting deactivated mark to exist, can operate off and on.
Wherein being used to produce the coil that deactivates magnetic field is used to show some advantages around magnetic core mark maker deactivation device on every side with respect to the maker deactivation device that utilizes air-core.As mentioned above, for a bipolar intended size that will produce, can be made littler dimensionally than air-core device based on the magnetic core of coil maker deactivation device.In addition, for will obtain a given magnetic field magnetic recording level under the certain range of excitation current condition, if magnetic core is provided, in fact the numbers of copper lines that will use on coil winding may be reduced, and therefore reduces the cost of device.Magnetic core providing being greater than of saving on the copper cash and to pay in the magnetic core, because can be made of very cheap material.And, along with the minimizing of numbers of copper lines, and in the excitation of low current level, in the energy loss on the copper cash far below the loss in the air-core coil, and this saving is used for the small current loss of magnetic core itself greater than replenishing, because being lost on the optimal operations frequency of magnetic core is low.Then, the expense of device operation is reduced, and not expensive driving circuit can be used.
Although not expression in the drawings wants to insert a magnetic shielding part and above installs the magnetic field that is provided to increase in the maker deactivation device of above narration.This shield member will be arranged by level and below coil twines one or more iron cores and can be made of the lamination transformer plate of compressing powder cast iron, and will be similar to U.S. Patent number 4,769, disclosed material in 631.Shield member should move down at least one inch to avoid the undesirable deflection in magnetic field of comfortable maker deactivation device upper space from magnetic core.
Operate in maker deactivation device disclosed herein, it was both relevant, also relevant with the magnetic mechanical mark that is included in disclosed a kind of low-coercivity bias element type in the copending application series number 08/697,629 with magnetic mechanical EAS mark commonly used.A kind of being suitable for, be called as " magnadur (MagnaDur) 20-4 " as the material of such low-coercivity bias element, it is from Pennsylvania, in fourth (Reading), woodcraft joint-stock company, can buy from the market, and in fact have following composition: Fe
77.5Ni
19.3Cr
0.2Mn
0.3MO
2.4Si
0.3(atomic percent).The mark that utilization has the low-coercivity bias element allows the deactivation magnetic field operation of maker deactivation device with a low relatively magnetic recording level.The operand power level of maker deactivation device can be low, makes that like this maker deactivation device can be by continued operation.This makes it mark the current operation that does not need to start maker deactivation device.Yet, as noted above, also consider, just when being detected by optical sensor, action operates maker deactivation device sometimes.Comprise that other intermittent operation technology of operating according to marker detection is also within imagination of the present invention.
In the present invention, be understood that coil should be considered to " winding " around the magnetic core element of correspondence, both can be cooperate the coil of magnetic core directly be wrapped in magnetic core around, also can be pre-the winding then after pre-the winding, by slippage to magnetic core.
Various variations in device and the practical application can not broken away from the present invention by popularization in front.The present invention's most preferred embodiment especially is to be explanation rather than restriction at this.
Claims (11)
1. equipment that is used to make the degaussing of magnetic mechanical mark is characterized in that:
Magnetic core in same plane;
One first coil is wound around described magnetic core with one first coil axis, described first coil axis is parallel to described magnetic core plane, one second coil is wound around described magnetic core with one second coil axis, and described second coil axis is parallel to described magnetic core plane and perpendicular to described first coil axis;
Exciting bank only is used at described first coil of excitation during the very first time intervening sequence rather than during second time interval sequence that replaces with very first time intervening sequence; And only be used to encourage described second coil during second time interval sequence rather than during described very first time intervening sequence.
2. equipment as claimed in claim 1, wherein said magnetic core is criss-cross and has first and second arms, and described first coil is wrapped in around the described the first arm, and described second coil is wrapped in around described second arm.
3. equipment as claimed in claim 2, it is characterized in that described magnetic core has three arm relative with the described mat woven of fine bamboo strips one arm and four arm relative with described second arm, described equipment comprises and is wrapped in the tertiary coil around the 3rd arm and is wrapped in the 4th coil around the 4th arm, wherein only during described very first time intervening sequence, described exciting bank encourages described first and tertiary coil, and excitation the described second and the 4th coil during described second time interval sequence only.
4. equipment as claimed in claim 1, wherein said magnetic core is a rectangle.
5. equipment as claimed in claim 4, wherein said magnetic core has first, second, third and fourth side, described the 3rd side is relative with described first side, described the 4th side is relative with described second side, described first coil is wrapped in around described first side, described second coil is wrapped in around described second side, described equipment comprises and is wrapped in the tertiary coil around described the 3rd side and is wrapped in the 4th coil around described the 4th side, wherein only encouraging described first and tertiary coil and excitation the described second and the 4th coil during described second time interval sequence only during the described very first time intervening sequence by described exciting bank.
6. equipment as claimed in claim 4, the wherein said magnetic core side of being.
7. equipment as claimed in claim 5, the wherein said magnetic core side of being.
8. equipment as claimed in claim 1, have at least one to be wound in wherein said first and second coils around described magnetic core a plurality of layers on every side, described a plurality of layer comprises an innermost layer and another layer, more near magnetic core, described innermost layer is by being constituted than the more number of turn of described another layer than described another layer for described innermost layer.
9. equipment as claimed in claim 1, at least one coil in the wherein said coil are wound in three layers that are made up of an innermost layer, middle layer and outermost layer; Described innermost layer than described middle layer near magnetic core, described middle layer than described outermost layer near magnetic core; Described innermost layer is made of the number of turn of Duoing than described middle layer, and described middle layer is made of the number of turn of Duoing than described outermost layer.
10. equipment as claimed in claim 1 is characterized in that described magnetic core is made up of first magnetic core and second magnetic core, and described first coil is wrapped in around first magnetic core of described magnetic core, and described second coil is wrapped in around second magnetic core of described magnetic core.
11. equipment as claimed in claim 1 is characterized in that described exciting bank responds to exchange current respectively in described two coils, exchange current be simultaneously and differ 90 ° phasing degree each other.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US09/016,175 US6060988A (en) | 1997-02-03 | 1998-01-30 | EAS marker deactivation device having core-wound energized coils |
| US09/016,175 | 1998-01-30 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1290385A CN1290385A (en) | 2001-04-04 |
| CN1129878C true CN1129878C (en) | 2003-12-03 |
Family
ID=21775790
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN98813372A Expired - Lifetime CN1129878C (en) | 1998-01-30 | 1998-12-21 | EAS maker deactivation device having core-wound energized coils |
Country Status (10)
| Country | Link |
|---|---|
| US (1) | US6060988A (en) |
| EP (1) | EP1064631B1 (en) |
| JP (1) | JP4271851B2 (en) |
| CN (1) | CN1129878C (en) |
| AU (1) | AU754327B2 (en) |
| BR (1) | BR9814917B1 (en) |
| CA (1) | CA2318086C (en) |
| DE (1) | DE69841046D1 (en) |
| WO (1) | WO1999039313A1 (en) |
| ZA (1) | ZA9945B (en) |
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| US6111507A (en) * | 1997-02-03 | 2000-08-29 | Sensormatic Electronics Corporation | Energizing circuit for EAS marker deactivation device |
| US6307468B1 (en) * | 1999-07-20 | 2001-10-23 | Avid Identification Systems, Inc. | Impedance matching network and multidimensional electromagnetic field coil for a transponder interrogator |
| AU4088301A (en) * | 2000-03-17 | 2001-09-24 | Redcliffe Magtronics Ltd | Activation and deactivation of magnetic components |
| WO2001084519A2 (en) * | 2000-05-04 | 2001-11-08 | Sensormatic Electronics Corporation | Hand-held scanner deactivator to deactivate magnetomechanical eas markers |
| US6783070B2 (en) * | 2001-01-02 | 2004-08-31 | Ronald L. Faria | Scaneze check-in-check-out library workstation |
| US7135978B2 (en) * | 2001-09-14 | 2006-11-14 | Calypso Medical Technologies, Inc. | Miniature resonating marker assembly |
| US7978078B2 (en) * | 2001-12-21 | 2011-07-12 | Sensormatic Electronics, LLC | Magnetic core transceiver for electronic article surveillance marker detection |
| US7215250B2 (en) * | 2002-11-22 | 2007-05-08 | Sensormatic Electronics Corporation | Proximity detaching for electronic article surveillance tags |
| US7019651B2 (en) * | 2003-06-16 | 2006-03-28 | Sensormatic Electronics Corporation | EAS and RFID systems incorporating field canceling core antennas |
| US7068172B2 (en) * | 2004-05-21 | 2006-06-27 | Xiao Hui Yang | Method and apparatus for deactivating an EAS device |
| GB2415865A (en) * | 2004-07-02 | 2006-01-04 | Redcliffe Ltd | Arrangement of demagnetising coil pairs for EAS tag deactivation unit |
| JP2006220420A (en) * | 2005-02-08 | 2006-08-24 | Lintec Corp | System for determining magnetic detection tag |
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| ATE472786T1 (en) * | 2006-04-05 | 2010-07-15 | Sensormatic Electronics Corp | ELECTRONIC ARTICLE SECURITY ACTIVATION/DEACTIVATION MACHINE AND METHOD THEREOF |
| GB2440571A (en) * | 2006-08-01 | 2008-02-06 | Splashpower Ltd | Drive for an inductive coupling with a changing magnetic field direction |
| WO2008154404A2 (en) * | 2007-06-08 | 2008-12-18 | Checkpoint Systems, Inc. | Dynamic eas detection system and method |
| US8933790B2 (en) * | 2007-06-08 | 2015-01-13 | Checkpoint Systems, Inc. | Phase coupler for rotating fields |
| US20090212952A1 (en) * | 2008-02-22 | 2009-08-27 | Xiao Hui Yang | Method and apparatus for de-activating eas markers |
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| JP6039583B2 (en) * | 2011-12-28 | 2016-12-07 | 日本発條株式会社 | Non-contact information medium, bobbin member for non-contact information medium, main body member for non-contact information medium, and method for manufacturing non-contact information medium |
| CN105229711B (en) * | 2013-03-14 | 2019-07-09 | 泰科消防及安全有限公司 | Mobile EAS deactivator |
| CN108933015B (en) * | 2018-07-20 | 2020-11-06 | 深圳普诺玛商业安全设备有限公司 | Demagnetization circuit, demagnetizer and control method of demagnetization circuit |
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- 1998-01-30 US US09/016,175 patent/US6060988A/en not_active Expired - Lifetime
- 1998-12-21 WO PCT/US1998/027334 patent/WO1999039313A1/en active IP Right Grant
- 1998-12-21 DE DE69841046T patent/DE69841046D1/en not_active Expired - Lifetime
- 1998-12-21 CA CA002318086A patent/CA2318086C/en not_active Expired - Lifetime
- 1998-12-21 JP JP2000529696A patent/JP4271851B2/en not_active Expired - Fee Related
- 1998-12-21 AU AU19417/99A patent/AU754327B2/en not_active Ceased
- 1998-12-21 CN CN98813372A patent/CN1129878C/en not_active Expired - Lifetime
- 1998-12-21 BR BRPI9814917-2A patent/BR9814917B1/en not_active IP Right Cessation
- 1998-12-21 EP EP98964244A patent/EP1064631B1/en not_active Expired - Lifetime
-
1999
- 1999-01-05 ZA ZA9900045A patent/ZA9945B/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| AU754327B2 (en) | 2002-11-14 |
| AU1941799A (en) | 1999-08-16 |
| JP2002502079A (en) | 2002-01-22 |
| US6060988A (en) | 2000-05-09 |
| CN1290385A (en) | 2001-04-04 |
| BR9814917A (en) | 2001-10-23 |
| CA2318086C (en) | 2009-09-08 |
| DE69841046D1 (en) | 2009-09-17 |
| EP1064631B1 (en) | 2009-08-05 |
| BR9814917B1 (en) | 2011-11-16 |
| ZA9945B (en) | 2000-06-27 |
| EP1064631A1 (en) | 2001-01-03 |
| JP4271851B2 (en) | 2009-06-03 |
| WO1999039313A1 (en) | 1999-08-05 |
| CA2318086A1 (en) | 1999-08-05 |
| EP1064631A4 (en) | 2005-02-23 |
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Owner name: ADT SERVICE LLC Free format text: FORMER OWNER: SENSOR ELECTRONICS CO., LTD. Effective date: 20150811 Owner name: SENSOR ELECTRONICS CO., LTD. Free format text: FORMER OWNER: SENSORMATIC ELECTRONICS CORPORATION Effective date: 20150811 Owner name: TYCO FIRE + SECURITY GMBH Free format text: FORMER OWNER: ADT SERVICE LLC Effective date: 20150811 |
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